Nasal polyps

Hi,
I have not got Hebrew fonts but you can reply in Hebrew, thanks.
I've had nasal polyps on the left side for 7-8 years as far as I know.
I went to a few otolaryngologists in the past, had a MRI scan and they suggested just to leave them.
The last otolaryngologist that I went to, gave me antibiotics and steroid drops for 2 months, they did not shrink the polyps so he said that I need to have an endoscopic surgery to remove them as because it’s on one side it could be a papilloma and the only way to know if it is – to remove them.
I asked him if it’s definitely a benign growth and he said that it probably is as they were there for so long time.
I also had a cough for almost year now – he seems to think it’s unrelated.
What do you think about it ?
Do I need to have a surgery? Is there any chance for it being malignant?
Thank you